1 /* blockdev.c -show/set blockdev information.
2 *
3 * Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
4 *
5 * No Standard.
6
7 USE_BLOCKDEV(NEWTOY(blockdev, "<1>1(setro)(setrw)(getro)(getss)(getbsz)(setbsz)#<0(getsz)(getsize)(getsize64)(flushbufs)(rereadpt)",TOYFLAG_USR|TOYFLAG_BIN))
8
9 config BLOCKDEV
10 bool "blockdev"
11 default y
12 help
13 usage: blockdev --OPTION... BLOCKDEV...
14
15 Call ioctl(s) on each listed block device
16
17 OPTIONs:
18 --setro Set read only
19 --setrw Set read write
20 --getro Get read only
21 --getss Get sector size
22 --getbsz Get block size
23 --setbsz BYTES Set block size
24 --getsz Get device size in 512-byte sectors
25 --getsize Get device size in sectors (deprecated)
26 --getsize64 Get device size in bytes
27 --flushbufs Flush buffers
28 --rereadpt Reread partition table
29 */
30
31 #define FOR_blockdev
32 #include "toys.h"
33 #include <linux/fs.h>
34
GLOBALS(long bsz;)35 GLOBALS(
36 long bsz;
37 )
38
39 void blockdev_main(void)
40 {
41 int cmds[] = {BLKRRPART, BLKFLSBUF, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
42 BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
43 char **ss;
44 long long val = 0;
45
46 if (!toys.optflags) help_exit("need --option");
47
48 for (ss = toys.optargs; *ss; ss++) {
49 int fd = xopenro(*ss), i;
50
51 // Command line order discarded so perform multiple operations in flag order
52 for (i = 0; i < 32; i++) {
53 long flag = toys.optflags & (1<<i);
54
55 if (!flag) continue;
56
57 if (flag & FLAG_setbsz) val = TT.bsz;
58 else val = !!(flag & FLAG_setro);
59
60 xioctl(fd, cmds[i], &val);
61
62 flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw;
63 if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
64 }
65 xclose(fd);
66 }
67 }
68